CVE-2025-68664 | LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate Lang
LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in versions 0.3.81 and 1.2.5.
- 🔗 github.com/langchain-ai/langchain/security/advisorie…
- 🔗 github.com/langchain-ai/langchain/pull/34455
- 🔗 github.com/langchain-ai/langchain/pull/34458
- 🔗 github.com/langchain-ai/langchain/commit/5ec0fa69de3…
- 🔗 github.com/langchain-ai/langchain/commit/d9ec4c5cc78…
- 🔗 github.com/langchain-ai/langchain/releases/tag/langc…
- 🔗 github.com/langchain-ai/langchain/releases/tag/langc…
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| Tier | 2026-08-29 | 2026-09-06 |
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CVE-2025-68664 | LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate Lang
LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictiona